| Big name in business planes | 27 |
| Big name in cake mix | 20 |
| Big name in cakes | 17 |
| Big name in calculators | 23 |
| Big name in calculators and digital watches | 43 |
| Big name in California wine | 27 |
| Big name in California wines | 28 |
| Big name in camera film | 23 |
| Big name in cameras | 19 |
| Big name in cameras and copiers | 31 |
| Big name in campers | 19 |
| Big name in campgrounds | 23 |
| Big name in camping gear | 24 |
| Big name in can-making | 22 |
| Big name in Canadian gas | 24 |
| Big name in candy | 17 |
| Big name in candy corn | 22 |
| Big name in candy cups | 22 |
| Big name in candy wafers | 24 |
| Big name in canine care | 23 |
| Big name in canned fruit | 24 |
| Big name in car batteries | 25 |
| Big name in car care | 20 |
| Big name in car monitors | 24 |
| Big name in car parts | 21 |
| Big name in car racks | 21 |
| Big name in car rental | 22 |
| Big name in car-quality surveys | 31 |
| Big name in cards | 17 |
| Big name in carpet cleaning | 27 |
| Big name in cartography | 23 |
| Big name in cash machines | 25 |
| Big name in cassette tapes | 26 |
| Big name in casual clothes | 26 |
| Big name in casual clothing since 1969 | 38 |
| Big name in casual wear | 23 |
| Big name in catalogs | 20 |
| Big name in catalogues | 22 |
| Big name in caulk | 17 |
| Big name in caulking products | 29 |
| Big name in CBS history | 23 |
| Big name in CD burning software, to the extent that CDs still get burned | 72 |
| Big name in cell phone service | 30 |
| Big name in cell service | 24 |
| Big name in cells | 17 |
| Big name in cellular service | 28 |
| Big name in chain saws and leaf blowers | 39 |
| Big name in chairs | 18 |
| Big name in Champagne | 21 |
| Big name in cheese | 18 |
| Big name in cheesecake | 22 |
| Big name in chemicals | 21 |
| Big name in chess | 17 |
| Big name in Chi-town | 20 |
| Big name in Chicago | 19 |
| Big name in Chicago politics | 28 |
| Big name in chicken | 19 |
| Big name in chickens | 20 |
| Big name in child education | 27 |
| Big name in child psychology | 28 |
| Big name in children's books | 32 |
| Big name in children's fiction | 34 |
| Big name in children's sleepwear | 36 |
| Big name in china | 17 |
| Big name in Chinese history | 27 |
| Big name in chips | 17 |
| Big name in chocolate | 21 |
| Big name in Christian rock | 26 |
| Big name in Chrysler history | 28 |
| Big name in cinemas | 19 |
| Big name in circular saws | 25 |
| Big name in circuses | 20 |
| Big name in civil rights | 24 |
| Big name in classic video games | 31 |
| Big name in classical education? | 32 |
| Big name in classical guitars | 29 |
| Big name in cloud storage | 25 |
| Big name in coffee makers | 25 |
| Big name in coffeemakers | 24 |
| Big name in coffemakers | 23 |
| Big name in Cognac | 18 |
| Big name in collectible cards | 29 |
| Big name in collectibles | 24 |
| Big name in college guides | 26 |
| Big name in colonial Massachusetts | 34 |
| Big name in columns | 19 |
| Big name in combines | 20 |
| Big name in comedy | 18 |
| Big name in comic books | 23 |
| Big name in comix | 17 |
| Big name in communications history | 34 |
| Big name in communism | 21 |
| Big name in communism and comedy | 32 |
| Big name in compacts | 20 |
| Big name in compilation albums | 30 |
| Big name in computer chips | 26 |
| Big name in computer games | 26 |
| Big name in computer hardware | 29 |
| Big name in computer history | 28 |
| Big name in computer networks | 29 |